Preparation and properties of hyperbranched polyurethane acrylate adhesive
Hyperbranched polyurethane acrylate(HPUA)was prepared by using isophorone diisocyanate,polytetrahydrofuranediol,trimethylolpropane,and hydroxyethyl methacrylate as raw materials.A series of photocuring adhesives were prepared by adding photoinitiators and active diluents,and their structural characterization and thermal stability were studied.The effects of the type of photoinitiator,the ratio of HPUA to the active diluent trimethylolpropane triacrylate(TMPTA),and the amount of siloxane coupling agent(3-aminopropyltriethoxysilane)on the properties of photocuring adhesive were explored.The research results showed that the expected product was successfully prepared,and the synthesized HPUA had excellent thermal stability.When using 3%mass fraction of photo initiator Irgacure1173,m(HPUA):m(TMPTA)=1∶1,and adding 3%content of 3-aminopropyltriethoxysilane,the comprehensive performance of the photocuring adhesive was the best.At this time,the tensile shear strength of the adhesive to the glass substrate was 2.15 MPa,the elongation at break was 49.23%,the gelation rate was 98.56%,the volume shrinkage rate was 1.02%,and the Shore hardness was D55.
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